JPH02256880A - Motion valve device of internal combustion engine - Google Patents

Abstract

PURPOSE:To scavenge an ignition plug with service time swirling, enhance the heat efficiency, and reduce the number of parts used by locating the ignition plug between two exhaust valves of a cylinder head of an internal-combustion engine having two suction valves and two exhaust valves in one combustion chamber. CONSTITUTION:In the case No.1 suction port 12-1 is blocked by a valve body 46 so as to suppress the rate of fuel consumption when a multi-valve internal- combustion engine 2 is operated, a swirl is generated in the combustion chamber 14 as shown by the arrow. This swirl reaches the ignition plug 40 and performs scavenge of the ignition plug 40. In the case of a moving valve mechanism 24 of one-cam type, accordingly, No.2 locker shaft on the exhaust side is prevented from being parted, cylinder by cylinder, by a hole for plug wrench, and this allows constructing the locker shaft in a single piece. This also enhances rigidity in mounting of the locker shaft and reduces noise and vibration to be generated in the moving valve system, and further the number of parts can be decreased to simplify the constitution and suppress the cost.

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a valve train for an internal combustion engine, and particularly relates to a valve train for an internal combustion engine, in particular a combustion chamber in which, for example, two intake valves and two exhaust valves are respectively disposed. The present invention relates to a valve train for a multi-valve internal combustion engine.

[Prior Art] An internal combustion engine, for example, a multi-valve internal combustion engine, has a valve mechanism that has two intake valves and two exhaust valves in one combustion chamber. The exhaust valves are simultaneously opened and closed using one valve timing, and the two exhaust valves are simultaneously opened and closed using other valve timings.

As a valve train for an internal combustion engine, Japanese Patent Application Laid-Open No. 63-18115
There is something disclosed in the publication No. The valve train mechanism for an internal combustion engine disclosed in this publication includes - camshafts and two rocker arm shafts, and two intake valves and two exhaust valves each arranged in one combustion chamber. In addition to providing a plug hole for inserting a spark plug that slopes upward from the center of the top of the combustion chamber, one of the rocker arm shafts is supported by a cam holder and a plug insertion tube to reduce the occurrence of knocking and improve combustion efficiency. At the same time, the number of parts has been reduced to reduce assembly man-hours.

There is also one disclosed in Japanese Patent Application Laid-Open No. 18103/1983. The 5OHC internal combustion engine disclosed in this publication is
A bearing wall is integrally molded on the cylinder head so as to cross the axis of the cylinder, and the camshaft is supported by a bearing formed between a joint surface between a holder fixed to the bearing wall and the bearing wall, and the camshaft is supported by the bearing wall and the holder. A plug housing hole is provided to accommodate the spark plug, which simplifies the structure and improves ease of assembly, contributing to improved ease of assembly to the cylinder head and weight reduction of the camshaft.

[Problems to be solved by the invention] By the way, in the conventional valve train for an internal combustion engine, the fifth
．． As shown in FIG. 6, a spark plug 140 is disposed at a substantially central portion of the combustion chamber 114 on the lower surface of the cylinder head 104.

Therefore, in the case of a single-force type valve train, the 20th lever shaft 136 on the exhaust side is separated for each cylinder by, for example, the hole 152 for the plug wrench 150, as shown in FIG. There is a risk that the mounting rigidity of the 20th lever shaft 136 will weaken, causing large vibrations and noise in the valve train system, and the number of parts will increase, making the configuration complex, making manufacturing difficult, and increasing costs. There is an inconvenience that this happens.

Further, as shown in FIG. 6, in a mechanism in which one first intake port 112-1 of the intake system is closed by a valve body 146 to generate a swirl in the combustion chamber 114 in order to improve fuel efficiency, the sixth As shown by the white arrow in the figure, even if a swirl occurs in the combustion chamber 114, the spark plug 140 in the center of the combustion chamber 114 is not sufficiently scavenged, resulting in a decrease in thermal efficiency, worsening fuel efficiency, and reducing economic efficiency. There is a disadvantage that it is disadvantageous.

[Object of the Invention] Therefore, an object of the present invention is to provide a spark plug between two exhaust valves of a cylinder head of an internal combustion engine having two intake valves and two exhaust valves, in order to eliminate the above-mentioned disadvantages. By arranging the spark plug in the same position as above, it is possible to reduce the number of parts and simplify the configuration, and to realize a valve operating device for an internal combustion engine that can sufficiently scavenge the spark plug by swirl and improve thermal efficiency.

[Means for solving the problem] In order to achieve this object, the present invention provides two combustion chambers in one combustion chamber.
A valve operating system for an internal combustion engine having two intake valves and two exhaust valves is characterized in that a spark plug is disposed between the two exhaust valves of the cylinder head of the internal combustion engine.

[Function] With this configuration as described above, when the internal combustion engine is operating, the swirl sufficiently scavenges the spark plug, improving thermal efficiency, and simplifying the configuration by reducing the number of parts. There is.

[Examples] Examples of the present invention will be described in detail below based on the drawings.

1 to 3 show embodiments of this invention. 1st
．． In Fig. 3, 2 is an internal combustion engine, for example, a single-force type multi-valve internal combustion engine, 4 is a cylinder head, 6 is a cylinder block, 8 is a cylinder head cover, 10 is an oil pan,
12-1.12-2 is the first and second intake boat, 14 is the combustion chamber, 16 is the piston, 18-1.1B-2 is the first and second exhaust boat, 20-1.20-2 is a plurality of pieces, for example 2
The first and second intake valves 22-1 and 22-2 are the two first and second exhaust valves.

the first and second intake valves 20-1, 20-2 and the first;
As shown in FIG. 1.3, the second exhaust valves 22-1 and 22-2 are configured to be opened and closed by a valve operating mechanism 24, which is, for example, an overhead cam type valve operating apparatus.

The valve mechanism 24 includes a camshaft 28 that rotates in conjunction with the rotational movement of the crankshaft 26, a cam 30 provided on the camshaft 28, and a cam 30 that is oscillated by the cam 30 to operate the first and second intake valves 20-. 1.20-2 The tenth latch shaft 32 and tenth latch arm 34 on the intake side that open and close the valve, and the first and second exhaust valves 22-, which are swung by the cam 30,
1.20 Exhaust side 20th lever shaft 3 that opens and closes 22-2
6 and a 20th claw arm 38.

the first and second intake valves 20-1, 20-2 and the first;
The second exhaust valve 22-1, 22-2 is arranged on the lower surface of the cylinder head 4, as shown in FIG. 1.3.

A spark plug 40 is disposed between the first and second exhaust valves 22-1 and 22-2 of the cylinder head 8 of the internal combustion engine 2, as shown in FIG. 1.2.

Note that 42 is the first valve spring on the intake side, 44 is the second valve spring on the exhaust side, and 46 is the first intake bow)
This is a valve body that operates to open and close 12-1.

Next, the effect will be explained.

When the multi-valve internal combustion engine 2 is in operation, as shown in FIG. 2, if the first intake port 12-1 is closed by the valve body 46 in order to improve fuel efficiency, the outline arrow in FIG. Swirl occurs within the combustion chamber 14 as shown in FIG. Then, the generated swirl reaches the spark plug 40 portion and scavenges the spark plug 40.

As a result, in the case of a single-force type valve train 24, it is possible to prevent the 20th lever shaft on the exhaust side from being separated for each cylinder by the hole for a plug wrench, for example, and to unify the rocker shaft. It is possible to improve the mounting rigidity of the rocker shaft, reduce the vibration and noise of the valve train, and reduce the number of parts, simplify the configuration, and reduce costs. It is.

In addition, as shown in FIG. 2, in a mechanism that closes one of the first intake bows 12-1 of the intake system with a valve body 46 to generate a swirl in the combustion chamber 14 in order to improve fuel efficiency, the second As shown by the white arrow in the figure, when a swirl occurs in the combustion chamber 14, the first and second exhaust valves 22-1.2
The air reaches the spark plug 40 disposed between 2 and 2, and the spark plug 40 is sufficiently scavenged, thereby improving thermal efficiency and significantly improving fuel efficiency, which is economically advantageous.

Note that the present invention is not limited to the above-described embodiments, and various modifications can be made.

For example, in the embodiments of the present invention, a single-force type multi-valve internal combustion engine has been described, but a multi-valve internal combustion engine with two
It is also possible to adopt a power ram system and configure it with two camshafts.

[Effects of the Invention] As described above in detail, according to the present invention, a spark plug is positioned between two exhaust valves of a cylinder head of an internal combustion engine having two intake valves and two exhaust valves. This arrangement prevents the exhaust side rocker shaft from being separated for each cylinder due to the plug wrench hole, for example, and improves the mounting rigidity of the rocker shaft, thereby reducing vibration and noise in the valve train. In addition, the number of parts can be reduced, the configuration can be simplified, and the cost can be reduced. In addition, in a mechanism that closes one boat in the intake system to generate swirl in the combustion chamber in order to improve fuel efficiency, when swirl occurs in the combustion chamber, it reaches the spark plug located between the exhaust valves. Enough scavenging of the spark plug can be achieved and improve thermal efficiency.
Fuel efficiency can be significantly improved.

[Brief explanation of drawings]

1 to 3 show embodiments of the present invention, FIG. 1 is a schematic perspective view of a valve mechanism of a multi-valve internal combustion engine, FIG. 2 is a schematic bottom view of a cylinder head, and FIG. 3 is a multi-valve internal combustion engine. FIG. 4 to 6 show the prior art of the present invention, FIG. 4 is a schematic enlarged plan view of a rocker arm, FIG. 5 is a schematic perspective view of a valve mechanism of a multi-valve internal combustion engine, and FIG. 6 is a schematic diagram of a cylinder head. It is a bottom view. In the figure, 2 is a multi-valve internal combustion engine, 4 is a cylinder head, 12-1.12-2 is a first and second intake boat, 14 is a combustion chamber, and 18-1.18-2 is a first and second exhaust port. port,
20-1.20-2 are the first and second intake valves, 22-1.2
2-2 are first and second exhaust valves, 24 is a valve mechanism, 26 is a crankshaft, 28 is a camshaft, 30 is a cam, 32 is a tenth hook shaft on the intake side, 34 is a tenth hook arm on the intake side, and 36 is a A 20th exhaust side lever shaft, 38 a 20th exhaust side lever arm, 40 a spark plug, and 46 a valve body. Patent Applicant Suzuki Motor Co., Ltd. Representative Patent Attorney Yoshimi Saigo Figure 1 Figure 3

Claims (1)

[Claims] 1. In a valve operating system for an internal combustion engine having two intake valves and two exhaust valves in one combustion chamber, a spark plug is arranged to be located between two exhaust valves of a cylinder head of the internal combustion engine. A valve train for an internal combustion engine, characterized by: